package com.hp.bon.sgw.wh.utils;

import java.security.Key;
import java.security.SecureRandom;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 
 * 使用DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储.
 * 
 * 方法: void getKey(String strKey)从strKey的字条生成一个Key
 * 
 * String getEncString(String strMing)对strMing进行加密,返回String密文 String
 * getDesString(String strMi)对strMin进行解密,返回String明文
 * 
 * byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[]
 * byteD)byte[]型的解密
 */

public class ThreeDESKeyParam {

	private static final ThreeDESKeyParam threedeskeyparam = new ThreeDESKeyParam();

	public static final ThreeDESKeyParam getInstance() {
		return threedeskeyparam;
	}

	private static final String ALGORITHM = "DESede";// DES or DESede

	/**
	 * 根据参数生成KEY
	 * 
	 * @param strKey
	 */
	private Key getKey(String strKey) {
		Key key = null;
		try {
			KeyGenerator _generator = KeyGenerator
					.getInstance(ThreeDESKeyParam.ALGORITHM);
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");  
		    secureRandom.setSeed(strKey.getBytes());  
			_generator.init(secureRandom);
			key = _generator.generateKey();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return key;
	}

	/**
	 * 加密String明文输入,String密文输出
	 * 
	 * @param strMing
	 * @return
	 */
	public String getEncString(String strMing, String codekey)throws Exception {
		Key key = getKey(codekey);// 生成密匙
		byte[] byteMi = null;
		byte[] byteMing = null;
		String strMi = "";
		BASE64Encoder base64en = new BASE64Encoder();
		try {
			byteMing = strMing.getBytes("UTF8");
			byteMi = this.getEncCode(byteMing, key);
			strMi = base64en.encode(byteMi);
		} catch (Exception e) {
			e.printStackTrace();
			throw e;
		} finally {
			base64en = null;
			byteMing = null;
			byteMi = null;
		}
		return strMi;
	}

	/**
	 * 解密 以String密文输入,String明文输出
	 * 
	 * @param strMi
	 * @return
	 * @throws Exception 
	 */
	public String getDesString(String strMi, String codekey) throws Exception {
		Key key = getKey(codekey);// 生成密匙
		BASE64Decoder base64De = new BASE64Decoder();
		byte[] byteMing = null;
		byte[] byteMi = null;
		String strMing = "";
		try {
			byteMi = base64De.decodeBuffer(strMi);
			byteMing = this.getDesCode(byteMi, key);
			strMing = new String(byteMing, "UTF8");
		} catch (Exception e) {
			e.printStackTrace();
			throw e;
		} finally {
			base64De = null;
			byteMing = null;
			byteMi = null;
		}
		return strMing;
	}

	/**
	 * 加密以byte[]明文输入,byte[]密文输出
	 * 
	 * @param byteS
	 * @return
	 */
	private byte[] getEncCode(byte[] byteS, Key key) {
		byte[] byteFina = null;
		Cipher cipher;
		try {
			cipher = Cipher.getInstance(ThreeDESKeyParam.ALGORITHM);
			cipher.init(Cipher.ENCRYPT_MODE, key);
			byteFina = cipher.doFinal(byteS);

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			cipher = null;
		}
		return byteFina;
	}

	/**
	 * 解密以byte[]密文输入,以byte[]明文输出
	 * 
	 * @param byteD
	 * @return
	 */
	private byte[] getDesCode(byte[] byteD, Key key) {
		Cipher cipher;
		byte[] byteFina = null;
		try {
			cipher = Cipher.getInstance(ThreeDESKeyParam.ALGORITHM);
			cipher.init(Cipher.DECRYPT_MODE, key);
			byteFina = cipher.doFinal(byteD);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			cipher = null;
		}
		return byteFina;

	}

	static public String generatorKey(int length) {
		String val = "";
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
			// 输出字母还是数字
			if ("char".equalsIgnoreCase(charOrNum)) // 字符串
			{
				int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; // 取得大写字母还是小写字母
				val += (char) (choice + random.nextInt(26));
			} else if ("num".equalsIgnoreCase(charOrNum)) // 数字

			{
				val += String.valueOf(random.nextInt(10));
			}
		}
		return val;
	}
	
	
	public static void main(String[] args) {
		ThreeDESKeyParam des =  ThreeDESKeyParam.getInstance();//   new ThreeDESKeyParam.  ();// 实例化一个对像
		// des.getKey("A1323W3435363738");// 生成密匙
		//String ecodekey = generatorKey(16); // "A1323W3435363738";
		String ecodekey="U727384c960ZmaRu4683758Wr2i81aJS";
		String strEnc = "kIYTQ4KVoE5KBOQqpWi3e+ZAyzsxbRRaGHsroO+Ts5Ln2qMbB7LOrg==";
		System.out.println("original String:" + strEnc);
		
		/*		String strEnc=null;
		try {
			strEnc = des.getEncString(srcString, ecodekey);
			System.out.println("ecode String :" + strEnc);
		} catch (Exception e) {
			e.printStackTrace();
		}// 加密字符串,返回String的密文
		*/
		
		String decodekey = ecodekey;
		String strDes;
		try {
			strDes = des.getDesString(strEnc, decodekey);
		} catch (Exception e) {
			e.printStackTrace();
		}
					
	}

}
